|
|
TerracingUse terraces to make flower and vegetable gardening possible on steep slopes, or simply to add interest to your landscape. In Your BackyardTerraces can create several mini-gardens in your backyard. On steep slopes, terracing can make planting a garden possible. Terraces prevent erosion by shortening the long slope into a series of shorter, more level steps. This allows heavy rains to soak into the soil rather than run off and cause erosion. Materials for TerracesNumerous materials are available for building terraces. Treated wood is often used because of several advantages: it is easy to work with, blends well with plants, and is often less expensive than other materials. There are many types of treated wood on the market--from railroad ties to landscaping timbers. These materials will last for years. While there has been some concern about using these treated materials around plants, studies by Texas A&M University and the Southwest Research Institute concluded that these materials are not harmful to gardens or people when used as recommended. Other materials for terraces include bricks, rocks, concrete blocks, and similar masonry materials. Some masonry materials are made specifically for walls and terraces and can be more easily installed by a homeowner than other materials such as field stone and brick. Most stone or masonry products tend to be more expensive than wood. Height of WallsThe steepness of the slope often dictates wall height. Make the terraces in your yard high enough so the land between them is fairly level. Be sure the terrace material is strong enough and anchored well enough to stay in place through freezing and thawing, and heavy rainstorms. Do not underestimate the pressure of water-logged soil behind a wall. It can be enormous and cause improperly constructed walls to bulge or collapse. Many communities have building codes for walls and terraces. Large projects will need the expertise of a professional to make sure the walls can stand up to water pressure in the soil. Large terraces also need to be built with proper drainage and to be tied back into the slope properly. Because of the expertise and equipment required to do this correctly, you will probably want to restrict terraces you build yourself to no more than a foot or two high. Building a TerraceThe safest way to build a terrace is probably the cut and fill method. With this method, little soil is disturbed, giving you protection from erosion should a sudden storm occur while the work is in progress. This method will also require little, if any, additional soil.
Other Options for SlopesIf terraces are beyond the limits of your time or money, you may want to consider other options for backyard slopes. If you have a slope that is hard to mow, consider using groundcovers other than grass. There are many plants adapted to a wide range of light and moisture conditions that require little care, but provide soil erosion protection. These include:
Stripcropping is another way to deal with long slopes. Rather than terracing to make garden beds level, plant perennial beds and strips of grass across the slope. Once established, many perennials are effective in reducing erosion. Mulch also helps reduce erosion. The erosion that may occur will be primarily limited to the garden area. The grass strips will act as filter strips and catch much of the soil that may run off the beds. Grass strips should be wide enough to mow across the hill easily as well as wide enough to effectively reduce erosion. On the FarmTerraces catch runoff water, let the water soak into the ground, and deliver the excess safely to the bottom of a hillside much like eavespouts on a house. The earthen ridges built around a hillside on the contour cut a long slope into shorter slopes, preventing water from building to a highly erosive force. Some terraces are seeded to grass, which provides erosion control and a nesting area for birds. Terraces are often used in combination with other conservation practices to provide more complete soil protection. Stripcropping is a common erosion control practice on many farms. Farmers often alternate strips of corn or soybeans with strips of hay. Many farmers put erosion prone areas into permanent cover. More About Backyard Conservation |
|